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Hastelloy C22 Bolts Manufacturer & Exporter in India

Explore Hastelloy C22 Bolts Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
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-200

Min Temp

1100

Max Temp

🌡

1100

Suitable for continuous service up to approximately 1100°C under typical operating conditions.

⚡

800

Typical tensile strength around 800 MPa depending on product form and heat treatment.

🛡

Excellent

Excellent corrosion resistance in a wide range of industrial environments.

⚖

8.9

Typical density is approximately 8.9 g/cm³.

Product Overview

What are Hastelloy C22 Bolts?

Hastelloy C22 bolts are nickel-chromium-molybdenum-tungsten alloy fasteners machined from UNS N06022 bar stock conforming to ASTM B574. The alloy’s exceptional corrosion resistance stems from its precisely balanced chemistry – 20-22.5% chromium, 12.5-14.5% molybdenum, and 2.5-3.5% tungsten – delivering outstanding resistance to both oxidising and reducing corrosive media simultaneously.

With a PREN exceeding 65, Hastelloy C22 bolts outperform virtually every other wrought nickel alloy in mixed-acid environments, wet chlorine service, and hypochlorite-bearing process streams. These fasteners are specified under NACE MR0175/ISO 15156 for sour-service applications and are the preferred choice for chemical process flanges, pharmaceutical reactor closures, and offshore scrubber systems where no other alloy provides adequate service life.

Quick Specifications

MaterialHastelloy C22
UNS NumberN06022
DIN Number2.4602
Material StandardASTM B574
Bolt Standard (Metric)DIN 931 / DIN 933 / ISO 4014
Bolt Standard (Inch)ASME B18.2.1
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M100 / ¼"-4"
Tensile Strength690 MPa (100 ksi) min
Yield Strength283 MPa (41 ksi) min
HardnessMax 35 HRC / 241 HB
? All material certified by NABL-accredited laboratory. PMI available on request.

Complete the Fastener Set

Other Hastelloy C22 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Hastelloy C22 fastener range from certified nickel-molybdenum-chromium superalloy bar stock, including Hastelloy C22 Nuts, Hastelloy C22 Screws, Hastelloy C22 Washers, Hastelloy C22 Studs, and Hastelloy C22 Threaded Rods. All Hastelloy C22 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Hastelloy C22 Nuts
Hastelloy C22 Screws
Hastelloy C22 Washers
Hastelloy C22 Studs
Hastelloy C22 Threaded Rods

Technical Data

Hastelloy C22 Bolts Dimensions, Sizes & Thread Standards

Hastelloy C22 Bolts are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 931 (partial thread) / DIN 933 (full thread) / ISO 4014. Custom lengths in 5mm increments. Inch dimensions available per ASME B18.2.1. All Hastelloy C22 bolts dimensions are verified against applicable DIN, ISO, and ASME

Hex Bolt Dimensions - Metric (DIN 931 / ISO 4014)

Size (M)Pitch (mm)A/F (mm)Head Ht (mm)Min L (mm)Max L (mm)
M61.0104.010200
M81.25135.312250
M101.5176.416300
M121.75197.520400
M162.02410.025500
M202.53012.530600
M243.03615.040600
M303.54618.750800
M364.05522.5601000
M424.56526.0801000
M485.07530.01001200
M565.58535.01201500
M646.09540.01402000
M726.010545.01602000
M806.011550.01802500
M1006.014563.02003000

Dimensional & Material Standards

StandardCoversThread
DIN 931Hex bolts, partial threadMetric
DIN 933Hex bolts, full threadMetric
ISO 4014Hex head screws, partialMetric
ISO 4017Hex head screws, fullMetric
ASME B18.2.1Hex & heavy hex boltsUNC/UNF
ASME B16.5Stud bolts for flangesUNC
MSS SP-75Stud bolts, high-pressureUNC
Material StandardRequirement
ASTM B574Bar/rod - UNS N06022
ASTM F468Fastener mechanical properties
NACE MR0175Sour service =35 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Hastelloy C22 Chemical Composition

Hastelloy C22 Bolts derive their exceptional acid corrosion resistance from a precisely controlled nickel-molybdenum-chromium composition per ASTM. High molybdenum and tungsten content suppresses pitting and reducing-acid attack; ultra-low carbon (0.01% max) eliminates sensitization risk in welded assemblies. Full elemental composition is certified in the EN 10204 MTC supplied with every Hastelloy C22 bolts order from RealBolt.

Chemical Composition per ASTM B574

ElementComposition (%)
Nickel (Ni)Balance (min ~56%)
Chromium (Cr)20.0-22.5%
Molybdenum (Mo)12.5-14.5%
Tungsten (W)2.5-3.5%
Iron (Fe)2.0-6.0%
Cobalt (Co)2.5% max
Carbon (C)0.010% max
Manganese (Mn)0.50% max
Silicon (Si)0.08% max
Vanadium (V)0.35% max
Phosphorus (P)0.02% max
Sulphur (S)0.02% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Hastelloy C22 Alloy Composition Matters for Bolts

Mo (12.5–14.5%) + W (2.5–3.5%) — Dual Resistance to Oxidising and Reducing Media
The combined molybdenum and tungsten content gives Hastelloy C22 a PREN exceeding 65, providing resistance to both oxidising acids (nitric, chromic) and reducing acids (hydrochloric, sulphuric) simultaneously — a capability no single-element alloy can match. This dual resistance is critical for bolted connections in mixed-acid chemical reactors.
Cr (20–22.5%) — Oxidising Acid and Pitting Resistance
The elevated chromium content forms a highly stable passive oxide film that resists breakdown in wet chlorine, hypochlorite, and chlorine dioxide environments. Under bolt head bearing surfaces — where crevice conditions concentrate aggressive species — this passive film remains intact where C276 and 316L stainless would fail within months.
Ultra-Low Carbon (0.010% max) — Sensitisation-Free Welding
The extremely low carbon ceiling prevents carbide precipitation at grain boundaries during welding or elevated-temperature service. Hastelloy C22 bolts can be incorporated into welded assemblies without post-weld heat treatment, retaining full corrosion resistance in the heat-affected zone — a significant advantage over higher-carbon nickel alloys.

Fastener Performance

Hastelloy C22 Bolts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Hastelloy C22 Bolts per ASTM. Hastelloy C22 bolts achieve 800 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Tightening Torque Reference - Hastelloy C22 Hex Bolts

Bolt SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M12756028
M1618014467
M20360288107
M24625500155
M3012501000247
M3621801744358
M4234702776493
M4851504120648
?? Anti-galling: Use nickel-based anti-seize (Molykote P-37 or Bostik Never-Seez Pure Nickel). Lubricated values assume K=0.15. Never use copper-based anti-seize on nickel alloys - galvanic incompatibility accelerates thread corrosion.

Industry Applications

Hastelloy C22 Bolts Applications — Industries & End Uses

Hastelloy C22 Bolts from RealBolt are specified across chemical processing, pharmaceutical, oil and gas, and FGD where excellent corrosion resistance and 800 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples. Select an industry below to see specific Hastelloy C22 bolts application details and RealBolt stock availability.
Hastelloy C22 stud bolts and hex bolts are the benchmark specification for flanged closures on mixed-acid reactors, sulphuric acid concentrators, and nitric-hydrofluoric acid pickling systems. The alloy’s simultaneous resistance to oxidising and reducing media eliminates the need for dual-alloy bolting strategies. Compliant with NACE MR0175 for sour-service chemical plant applications.
Reactor closure bolts, agitator flange fasteners, and pressure vessel nozzle stud bolt sets for pharmaceutical API synthesis vessels and fine chemical batch reactors where product purity demands zero corrosion contamination. Hastelloy C22 is preferred over C276 in oxidising-acid wash environments common in pharmaceutical cleaning-in-place (CIP) cycles.
Flange bolt sets for FGD absorber tower internals, spray header connections, and mist eliminator support structures exposed to saturated SO2-bearing scrubbing liquor with chloride concentrations exceeding 80,000 ppm – conditions that cause rapid stress corrosion cracking in duplex stainless and pitting failure in C276 bolting within 18 months.
Stud bolt sets for chlorine dioxide bleaching tower flanges, hypochlorite stage vessel nozzles, and washer drum connections where alternating oxidising and reducing bleach chemicals attack conventional stainless and lower-grade nickel alloy fasteners. Hastelloy C22 provides the broadest corrosion resistance envelope of any commercially available bolt alloy in this service.

Hastelloy C22 Bolts Standards & International Certifications

Hastelloy C22 Bolts from RealBolt Engineering Industries are manufactured to internationally recognised fastener dimensional standards covering thread form, tolerances, strength grades, and quality requirements. Every batch ships with EN 10204 MTC 3.1/3.2, PMI (XRF), NACE MR0175/ISO 15156, and NABL-accredited lab reports — available on request for all orders.
Standards
DIN 931 DIN 933 ISO 4014 ISO 4017 ASME B18.2.1 IS 1364 IS 1367
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

Buy Hastelloy C22 Bolts from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Hastelloy C22 Bolts — for competitive pricing, EN 10204 MTC 3.1/3.2 documentation, and fast Mumbai dispatch. Standard sizes are ex-stock; custom dimensions accepted with 2–3 week lead time. Request your quote today.
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Answers for Buyers

Hastelloy C22 Bolts — Frequently Asked Questions

Browse expert answers to common questions about Hastelloy C22 Bolts from RealBolt — covering acid corrosion resistance, NACE MR0175 compliance, ASTM standards, available sizes, and MTC documentation. Contact our technical team directly for project-specific guidance on Hastelloy C22 bolts selection and pricing.
Hastelloy C22 hex bolts are manufactured to DIN 931 (metric partial thread), DIN 933 (metric full thread), ISO 4014/4017, and ASME B18.2.1 for inch hex and heavy hex configurations. Stud bolts for flanged connections are produced per ASME B16.5 (Class 150-2500) and MSS SP-75 for high-pressure service. Special thread forms including BSW, BSF, and BSPP are available on request with a 15 working day lead time. All bolts are machined from ASTM B574 UNS N06022 bar with full EN 10204 3.1 mill certification as standard.
Both alloys are nickel-chromium-molybdenum fastener materials, but Hastelloy C22 (UNS N06022) contains higher chromium (20-22.5% vs 14.5-16.5%) and adds tungsten (2.5-3.5%), giving it a PREN exceeding 65 versus approximately 69 for C276 in reducing media but significantly superior performance in oxidising acid environments such as nitric acid, chromic acid, and wet chlorine. Specify C22 when the process alternates between oxidising and reducing conditions, or when hypochlorite, chlorine dioxide, or mixed-acid streams are present. C276 remains preferred in pure reducing acid service (concentrated HCl, H2SO4) where oxidising species are absent.
Yes – Hastelloy C22 bolts supplied in the solution-annealed condition with hardness not exceeding 35 HRC (241 HB) fully comply with NACE MR0175/ISO 15156-3 for use in H2S-bearing sour service environments. Each batch is supplied with a hardness survey report confirming compliance. For critical sour-service flange bolt sets (Class 900 and above), we provide individual piece hardness testing with results documented on the EN 10204 3.1 MTC. NACE-compliant nuts in matching UNS N06022 are available as complete bolt-and-nut sets.
Always use a pure nickel-based anti-seize compound such as Molykote P-37, Bostik Never-Seez Pure Nickel, or Jet-Lube KOPR-KOTE Pure Nickel. Apply to the thread flanks and the nut bearing face before assembly. When using lubricated torque values, apply a nut factor (K) of 0.15. Copper-based, zinc-based, and graphite-based anti-seize compounds must never be used on Hastelloy C22 – the galvanic potential difference between copper or zinc and the nickel alloy substrate accelerates crevice corrosion under the nut bearing face, particularly in wet or immersed service conditions.

Industrial Cities We Serve:

  • Ahmedabad
  • Aurangabad
  • Bengaluru
  • Chennai
  • Coimbatore
  • Faridabad
  • Gandhidham
  • Greater Noida
  • Gurugram
  • Hazira
  • Hosur
  • Hyderabad
  • Jamnagar
  • Jamshedpur
  • Ludhiana
  • Mumbai
  • Mundra
  • Mysuru
  • Nagpur
  • Nashik
  • Navi Mumbai
  • Noida
  • Pune
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  • US
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